To claim hobby expenses you can claim expenses that are required to carry out the hobby. Such as in your example, cost of the coins, supplies, and shipping are all acceptable expenses. You can even claim expenses that help you develop your hobby in the amount up to the sale proceeds. So you would claim the expenses in your example and report the $10 in income.
With hobby income the most important item to remember is you can not exceed the profit and claim a loss on the hobby income. For example, if you use your example, and you sold the coins for $200 instead of $250. You could only claim expenses up to $0 in income.
For more information on hobby income and expenses, see the link below:
Hobby Income and Expenses
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